人体皮肤表面潜在手印的显现方法研究

Development of Latent Fingerprints on Human Skin

以热敏纸、收据纸、普通打印纸为载体,利用转印法对人体皮肤表面潜在手印进行提取。分别采用茚三酮法、磁性粉末法对已提取的潜在手印进行显现。在手印提取过程中,转印提取过程要一次完成,转印力度要大小适中,避免转印后的手印出现重叠、模糊、缺损等现象。在手印显现过程中,使用普通打印纸提取潜在手印时,选择茚三酮显现潜在手印的效果更佳;使用热敏纸提取潜在手印时,选择磁性粉末显现潜在手印的效果更佳。

We focused on the extraction and development of latent fingerprints on human skin. The latent fingerprints on human skin were extracted via a transfer printing approach, using the thermal paper, receipt paper, and ordinary printing paper as the transferring substrates. During the fingerprint extraction process, the pressure used should be suitable, in order to avoid the overlap, indistinction, and incompleteness of the extracted fingerprints. During the fingerprint development process, the ninhydrin method used to develop latent fingerprints exhibited better results when using ordinary printing paper as transferring substrates; while the magnetic powder method used to develop latent fingerprints exhibited better results when using thermal paper as transferring substrates.